What is heat?by Xilola Kayumova | 13-10-2016 03:04 |
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Cut a piece of clay and hold it in your hands. Its cold, right? Now, roll it in your hands for about 2 minutes. Feel the clay again and tell me, is it warm or cool? Where do you think the heat came from? Think of the kinds of food you like to eat. Before and after eating, you must wash your hands. Do you prefer washing your hands with icy-cold water or normal-warm water? Pretend you are in a forestand are very hungry, you only have 1kg of raw meat. What do you need in order to cook the meat? Long ago, people thought that heat was a liquid, which has the feature of moving from one thing to another. By this day, we all know that heat comes from atoms and molecules. For example, when atoms and molecules start moving fast in the air, days get hot and when they slow down, days get much colder. Many people dont know that heat and temperature are two different things. Heat is energy in motion, the enrgy that causes things to become warmer. Temperature is a measurement that indicates how hot or cold something is. Heat comes from fires. It also comes from sunlight. The light coming from the sun is the heat you and I can feel. So, it is very important in all of our lives. |
